Ford Focus Exhaust Leak

I also have a Ford Focus. I had a similar issue with the engine light and a rough idle. Did you check the exhaust pipe for leaks? Maybe the catalytic converter is faulty.

Thanks for the suggestion! I did check the exhaust pipe, and there seems to be a leak somewhere along the line. But could a faulty catalytic converter cause all those symptoms at once?

In my case, it did. The leak was minor at first, but it got worse over time, triggering the engine light and affecting performance. I'd suggest taking it to a workshop to get it checked properly.

Thanks a lot! I suspected that a visit to the shop would be inevitable. Turns out it was indeed the lambda sensor. The repair set me back 375€, but at least the car is running smoothly again.